These correlations offer little support for the view that low intelligence is a major cause of crime. Most of the measures of delinquency are very skewed (which is a problem I will try to look at later) but the correlations aren't consistently negative, and even the less skewed behaviors like being rowdy in public are not negatively related to IQ in a consistent way.

Most people with low IQs don't commit crimes, while some with high IQs do, so it's not surprising that the individual-level correlations are low. For this reason, the correct approach is to study aggregates like they did in the study above.

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